The dimerization of 1-mesityl-2,3,4-tri-t-butyl-1-silacyclobutadiene proceeds through an initial [1,5] sigmatropic shift to give a long-lived o-silaxylylene which subsequently undergoes Diels–Alder addition to the silicon–carbon double bond of a remaining silacyclobutadiene.
D. B. Puranik, M. P. Johnson and M. J. Fink, J. Chem. Soc., Chem. Commun., 1989, 706 DOI: 10.1039/C39890000706
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